Yes it can definitely be related! My current relationship started out in a very similar way. We have been together over 7 years now and are doing well so it can definitely be overcome.

Affection and closeness in a relationship is extremely important but it is also important to not lose your own identity as well. It seems that you are really struggling with that push/pull at the moment - wanting the closeness of the relationship but also worried about being locked into it. That is quite normal. It can take time to come to an understanding, especially in a new relationship.

I think the best thing for me with the reassurance was to just take it one thought at a time and debate it with myself. Eg. if he forgets to kiss you goodbye think it through. What other reasons could there be? Was he running late? Had you had a lot of hugs/kisses/affection already that morning? Could his mind just have been on other things? Does he always kiss you goodbye or only sometimes (so therefore he didn't know you really wanted/needed the kiss today)?
The more I did this the more I started to realise how irrational I was being. There were so many reasons that something could happen and I always seemed to assume the worst but when I did discuss it with my partner they had no idea that anything was wrong!

Also, have you been able to discuss all of this with your partner? I've found a lot of the time the things that appear so obvious to me my partner is completely oblivious to. It was all my own anxieties getting in the way. Sometimes having an honest discussion about what your concerns are and negotiating ways to overcome them, or even just seeking that assurance can be helpful. For example, discussing 'when you don't kiss me goodbye I worry that you don't think of me'. Often just the re-assurance that it does not mean what you think it means allows you to overcome the worry the next time he doesn't kiss you goodbye.

I really hope you can begin to work through it. It's not easy and takes a lot of time and self-reflection but it does get easier the more you do it.